While it’s an important fitness metric, you only get one reading per day.

The UP3 measured our morning resting heart rate at between 45 and 47bpm, which seemed low.

A connected Mio Fuse usually found our heart rate to be between 5-10bpm more, which calls into question the accuracy of the UP3.

Compared to a Withings Activité, the step count was also low, but as with all activity trackers as long as there's consistency, it doesn’t matter too much whether it’s a few hundred steps short in the day.

It will also track bursts of activity, and you can historically tag a wide range of sports; including running, cross-training, tennis, hiking and even dance and Zumba using the stopwatch feature and have those stats absorbed into your day.

The UP3 also calculates your calorie burn, based on your step count, using a basal metabolic rate (BMR) method; derived from your age, weight, height and activity, which seems archaic given the number of sensors on board.

Finally, the UP3 aims to keep you active by nudging you to move every hour or so.

DAILY STAR

COMFORT: The UP3 digs into the skin

SLEEP TRACKING

Jawbone claimed that, by monitoring a user's bpm, respiration rate, body temperature and galvanic skin response, it would be able to tell the difference between REM, light and deep sleep.

However, while the Jawbone UP3 produced some neat graphs, it often missed points where we woke up in the night, casting a big dose of doubt over its tracking credentials. Not impressive.

PH

SMART: The app records every part of your daily activity

APP

The revamped Jawbone UP app, the same one you'll use with the UP Move and the UP2, is one of the most comprehensive out there.

The app records every part of your daily activity, with this displayed in a timeline and a series of graphs and trends, and a major part of the experience is the new Smart Coach.

The Jawbone UP ecosystem is one of the best out there and there's a load of apps you can connect to your experience as well.

DAILY STAR ONLINE

UP3 Review

VERDICT

The basic fitness tracking works well, the design has its advantages and the UP app is superb – but you can get all this, for less money, with the UP2.

The UP3’s sleep tracking is nowhere near as scientifically accurate as claimed, the heart rate monitoring falls short of being useful and the new design, while looking pretty good, is fiddly.

If you want the latest fitness gadget the UP3 will do the job, but there are plenty of better and cheaper options on the market.